Small update to PR template

Author: bachya

.github/pull_request_template.md

@@ -3,6 +3,8 @@
 **Does this fix a specific issue?**
 
 Fixes https://github.com/bachya/python-simplisafe/issues/<ISSUE ID>
+  
+**Checklist:**
 
 - [ ] Confirm that one or more new tests is written for the new functionality.
 - [ ] Update `README.md` with any new documentation.